If there is thick and loose soil covering the opening of tunnel,the excavation of tunnel at the access will cause the change of stress state of surrounding rock to produce large displacement and probably lead to the enlargement of plastic zone of its upper covering soil generating obvious sliding plane and furthermore causing the landslide of opening.

Treatment of bedding plane landslide of face-upward slope at exit of tunnel;

Devastating effects on the road embankment stability and deformation were concerned because of the karster cave collapse resulting in obvious ground deformation.